Completely new guide for noobs. I just found a way to do it on my iPad 2 [Wifi only] on iOS 5.0.1..
1) Download the file above in step 3, then extract the folder to your Downloads. (Start Menu, your name, then on the left, downloads.)
2) There should now be a folder called: "cinject_0.4.3"
3) Open up CMD and type this (Without "" quotes..): "cd downloads"
4) Then, do: "cd cinject_0.4.3"
5) After so, type this command into cmd.. "cinject.exe -i payloads/jailbreak.mobileconfig"
6) On your device, click on install, and when prompted to type in a password, just click next, with no password in.
7) After so, type this command: "cinject.exe -j payloads"
8) Just wait a little bit. ( Don't freak out, or jizz )
9) Now after a few minutes from step 8, now type this command: "execute the command: cinject.exe -w"
10) On your device, after doing step 9, toggle the "VPN" switch on in the settings, in about a few seconds after, it should say error.
11) Wait, then it should restart. Cydia is now installed, and your device is now free!

Click to expand...

So I got to step #7 and after typing in cinject.exe -j payloads it would say:

Finding slide...
Failed
Error

So then I read that when you get this error you are supposed to restore your phone to get around this problem.

Ok so I figure that I will do that right on my phone so I went into Settings->General->Restore->Erase all content and settings

... but then it gives me an error that says "Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carriers store to receive a replacement SIM card"

Ok I thought. I'll just go to my carriers store and get a new sim card and I'll be fine right? WRONG

I went down this morning and got a new sim card from my carrier activated but my 4S still gives me the error. So now I have an appointment set up with my Apple store tomorrow in order to get my phone warrantied. Ugh.

Just wanted to give you guys the heads up so you don't make the same mistake I did

Btw if there is anything I actually can do in this situation to get it working let me know

... but then it gives me an error that says "Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carriers store to receive a replacement SIM card"

Ok I thought. I'll just go to my carriers store and get a new sim card and I'll be fine right? WRONG

I went down this morning and got a new sim card from my carrier activated but my 4S still gives me the error. So now I have an appointment set up with my Apple store tomorrow in order to get my phone warrantied. Ugh.

Just wanted to give you guys the heads up so you don't make the same mistake I did

Btw if there is anything I actually can do in this situation to get it working let me know

I went down this morning and got a new sim card from my carrier activated but my 4S still gives me the error. So now I have an appointment set up with my Apple store tomorrow in order to get my phone warrantied. Ugh.

I just tried the DFU restore. I went through the process and completely restored the phone. Then as I go through the setup process (language, country, location services, etc) it gives me the same "Only compatible SIM cards from a supported carrier may be used..." error

Are you sure your 4S is not locked to another carrier?
Did it accept that particular sim before?
I'd bring it to Apple if it still wont accept the sim if its supposed to be unlocked or locked to that carrier you're using.

I'd bring it to Apple if it still wont accept the sim if its supposed to be unlocked or locked to that carrier you're using.

Click to expand...

Yeah, I know Apple has great customer service so I don't think they will give me a hard time about getting a replacement. Just scary when this stuff happens since a pissed off genius could screw me over if he wanted to

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.